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US Patent: 25,460
Carpenter's Rule
Folding Rule Joint
Patentees:
David M. Smith - Springfield, VT
Hamlin Whitmore - Springfield, VT

USPTO Classifications:
403/146

Tool Categories:
rules : folding rules : folding rule joints

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Henry Barnard
B. F. Dana

Patent Dates:
Granted: Sep. 13, 1859

Patent Pictures:
USPTO pdf tiff
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Description:
This is a fairly simple joint for a folding rule, which uses small springs to keep a good friction fit after wear.

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